<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <button @click="increase">increase</button>
        <button @click="stop">stop</button>
        <br>
        {{ count }}
    </div>
    <script type="module">
        // https://www.yesno.wtf/api
        import { createApp, ref, watchEffect } from "./node_modules/vue/dist/vue.esm-browser.js"

        createApp({
            setup () {
                const count = ref(0)

                const stop = watchEffect(() => {
                    console.log(count.value);
                })
                return {
                    count,
                    stop,
                    increase: () => {
                        count.value++
                    }
                }
            }
        }).mount('#app')
    </script>
</body>
</html>